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math.RA2008
Generator coalgebras are not necessarily quasi-coFrobenius
Mariana Haim, Blas Torrecillas
We study the problem of whether a coalgebra that generates its category of left (right) comodules is left (right) quasi-coFrobenius or not. We prove it does not hold in general, by…
math.RA2006
Radford's formula for biFrobenius algebras and applications
Walter Ferrer Santos, Mariana Haim
In a biFrobenius algebra H, in particular in the case that H is a finite dimensional Hopf algebra, the antipode S can be decomposed as S= cf where c and f are the Frobenius and coF…